CN218006520U - Impedance tube expansion structure and impedance tube test system suite - Google Patents
Impedance tube expansion structure and impedance tube test system suite Download PDFInfo
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- CN218006520U CN218006520U CN202221618549.3U CN202221618549U CN218006520U CN 218006520 U CN218006520 U CN 218006520U CN 202221618549 U CN202221618549 U CN 202221618549U CN 218006520 U CN218006520 U CN 218006520U
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Abstract
The utility model discloses an impedance tube expanding structure and an impedance tube testing system suite, which comprises a transition tube, a square impedance tube and a sealing end structure; the first end of the transition pipe is provided with a first joint used for detachably connecting the sounding section of the circular impedance tube, and the second end of the transition pipe is provided with a second joint; the square impedance tube is provided with a first square tube cavity, the first end of the square impedance tube is connected to the second connector, and the second end of the square impedance tube is provided with a first sample cavity for accommodating a square sample; a sound transmission installation position for installing a sound transmission structure is arranged on one side of the square impedance tube and is positioned between the second joint and the first sample cavity; the end-sealing structure is connected to the second end of the square impedance tube and seals the second end of the square impedance tube. During the use, utilize the first joint of the section connection that gives sound of the circular impedance pipe of traditional circular impedance pipe test system, the structure of making a sound is installed in the installation position of making a sound, can carry out reliable acoustic performance test to the square sample that holds in the first sample intracavity, resources are saved, and is with low costs.
Description
Technical Field
The utility model belongs to acoustic performance test field, more specifically say, relate to impedance tube extending structure and impedance tube test system external member.
Background
The existing impedance tube test system mostly adopts a circular impedance tube, and is called as a circular impedance tube test system. A circular sample is made of traditional sound absorption materials (such as sound absorption cotton and cotton felt), namely, a circular impedance tube testing system can be used for testing acoustic performance, the sample making is convenient, but the circular impedance tube testing system cannot be used for testing acoustic performance of a test sample except for a circle.
The acoustic metamaterial is always a hot point for researching the metamaterial, but most of functional sound absorbing pieces made of the metamaterial are square pieces and cannot be made into round samples, so that the acoustic performance test cannot be carried out through a round impedance tube test system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an impedance tube extending structure and impedance tube test system external member to solve the problem that current scheme can not carry out the acoustic performance test to the side shape sample.
In order to achieve the purpose, the utility model provides an impedance tube expanding structure, which comprises a transition tube, a square impedance tube and a sealing end structure;
the first end of the transition pipe is provided with a first connector, the second end of the transition pipe is provided with a second connector, and the first connector is detachably connected to the sounding section of the circular impedance pipe;
the square impedance tube is provided with a first square tube cavity, the first end of the square impedance tube is connected to the second connector, and the second end of the square impedance tube is provided with a first sample cavity for accommodating a square sample; a sound transmission installation position for installing a sound transmission structure is arranged on one side of the square impedance tube and is positioned between the second joint and the first sample cavity;
the end-capping structure is connected to the second end of the square impedance tube and closes the second end of the square impedance tube.
Further, the square impedance tube comprises a transition connecting tube and a testing tube;
the first end of the transition connecting pipe is used for being detachably connected to the second connector;
the first end of the test tube is used for being detachably connected to the second joint or the second end of the transition connecting tube;
the sound transmission installation position and the first sample cavity are arranged on the test tube.
Further, the square impedance tube further comprises a microphone mounting part and an elastic ring;
the microphone mounting piece is arranged on the sound transmission mounting position and is provided with a through hole; the through hole comprises a first hole section and a second hole section which are sequentially communicated, and one end, far away from the first hole section, of the second hole section is communicated with the first square tube cavity; a limiting step is formed between the first hole section and the second hole section and used for limiting the microphone from sliding into the first square tube cavity;
the elastic ring is arranged in the first hole section and used for hermetically connecting the outer periphery of the microphone and the inner periphery of the first hole section.
Further, the end-sealing structure comprises a sample sending tube, a first end cover and a piston assembly;
the sample sending tube is provided with a second square tube cavity, and the first end of the sample sending tube is connected to the second end of the square impedance tube;
the first end cover is detachably covered on the second end of the sample sending pipe;
the piston assembly is arranged in the sample sending pipe in a sliding mode, and one end of the piston assembly penetrates out of the first end cover; the piston assembly is used for pushing the square sample entering the second square tube cavity from the second end of the sample sending tube into the square impedance tube.
Further, the end-capping structure comprises a second end cap, and the second end cap is detachably covered on the second end of the square impedance tube.
Further, the transition pipe also comprises a reducing pipe section connected between the first joint and the second joint, and the inner diameter of the reducing pipe section is gradually reduced along the direction close to the second joint;
the end face of the first end of the square impedance tube is abutted to the end face of the reducing tube section.
Further, the impedance tube comprises a first size adapter, wherein the first size adapter is provided with a first adapting groove, two ends of the first adapting groove penetrate through two ends of the first size adapter, and the first size adapter is detachably assembled in the square impedance tube;
the wall of the first adaptive groove and one side of the square impedance tube, which is provided with the sound transmission installation position, are enclosed to form a first sound transmission cavity, and the cross section of the first sound transmission cavity is square; the first end of the first sound transmission cavity is communicated to the transition pipe, and the second end of the first sound transmission cavity is provided with a second sample cavity for containing a square sample; the circumferential dimension of the second sample chamber is smaller than the circumferential dimension of the first sample chamber.
Further, the first size adapter includes a first adapter body section and a first transition slash section connected to an end of the first adapter body section, the first transition slash section located at the first end of the first size adapter; three inner sides of the first adapter body section each extend parallel to an axis of the first size fitting; the three inner sides of the first transition flare section each extend obliquely in a direction away from the axis of the first size fitting in a direction away from the first adapter body section.
Further, the size adapter comprises a second size adapter, wherein the second size adapter is provided with a second adapting groove, two ends of the second adapting groove penetrate through two ends of the second size adapter, and the second size adapter is detachably assembled in the first size adapter;
the wall of the second adaptive groove and one side of the square impedance tube, which is provided with the sound transmission installation position, are enclosed to form a second sound transmission cavity, and the cross section of the second sound transmission cavity is square; the first end of the second sound transmission cavity is communicated to the transition pipe, the second end of the second sound transmission cavity is provided with a third sample cavity used for containing a square sample, and the circumferential size of the third sample cavity is smaller than that of the second sample cavity.
Further, the second size adapter includes a second adapter body section and a second transition slash section connected to an end of the second adapter body section, the second transition slash section located at the first end of the second size adapter; the three inner sides of the second adapter body section each extend parallel to the axis of the second size adapter; the three inner sides of the second transition slash section, in a direction away from the second adapter body section, each extend slash in a direction away from the axis of the second size adapter.
Further, in the length direction of the impedance tube expansion structure, the end surface of the first end of the first size adapter is flush with the end surface of the first end of the square impedance tube;
in a length direction of the impedance tube extension, an end face of the first end of the second size adapter is flush with an interface of the second adapter body section and the second transition bezel section.
Furthermore, the number of the sound transmission installation positions is two, the two sound transmission installation positions are arranged at intervals along the length direction of the square impedance tube, and the two sound transmission installation positions are a first installation hole and a second installation hole respectively;
the impedance tube expanding structure further comprises a first connecting piece and a second connecting piece;
the first connecting piece is used for connecting the first size adapter to the pipe wall of the square impedance pipe, facing the first mounting hole; the first connecting piece connected to the first size adapter and the square impedance tube is opposite to the first mounting hole;
the second connector is used for connecting the second size adapter to the side wall of the first size adapter facing the second mounting hole; the second connecting piece connected to the second size adapting piece and the first size adapting piece is opposite to the second mounting hole.
The utility model also provides an impedance tube test system external member, including circular impedance tube test system and aforementioned impedance tube extending structure, circular impedance tube test system includes circular impedance tube and transaudient structure.
The utility model provides an impedance tube extending structure and impedance tube test system external member's beneficial effect lies in: when the test system is used, the sound generation section of the circular impedance tube of the traditional circular impedance tube test system is connected with the first connector, and the sound transmission structure of the traditional circular impedance tube test system is arranged at the sound transmission installation position, so that the reliable acoustic performance test can be performed on the square sample contained in the first sample cavity, and the test system is suitable for acoustic metamaterial samples; the acoustic performance test of the round sample can be realized by using part of the structure of the traditional round impedance tube test system, the impedance tube expanding structure is disassembled when the round sample needs to be tested, and the traditional round impedance tube test system is assembled, so that the acoustic performance test of the round sample can be realized, the resource is saved, the cost is low, and the application range of the impedance tube test system suite comprising the round impedance tube test system and the impedance tube expanding structure is expanded.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic view of a partial structure of an impedance tube testing system kit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an impedance tube expansion structure provided in an embodiment of the present invention;
fig. 3 is a schematic structural view of the impedance tube expansion structure shown in fig. 2 from another view angle;
fig. 4 is a first perspective view of a partial structure of the impedance tube expansion structure shown in fig. 2;
fig. 5 is a schematic perspective view of a connection tube of the impedance tube expanding structure shown in fig. 2;
fig. 6 is a schematic perspective view of a partial structure of the expanded structure of the impedance tube shown in fig. 2;
FIG. 7 is a schematic structural view of the test tube of FIG. 6;
FIG. 8 is a schematic view of the microphone mount of FIG. 6;
FIG. 9 is an enlarged cross-sectional view of the microphone mount of FIG. 8;
fig. 10 is a schematic partial structural view of an impedance tube expansion structure according to an embodiment of the present invention;
fig. 11 is a first usage state reference diagram of the impedance tube expansion structure according to the embodiment of the present invention;
FIG. 12 isbase:Sub>A cross-sectional view A-A of the structure shown in FIG. 11;
FIG. 13 is a partial schematic view of FIG. 12;
fig. 14 is a cross-sectional view of an impedance tube expansion structure provided in an embodiment of the present invention;
fig. 15 is a reference diagram of a second usage state of the impedance tube expansion structure according to the embodiment of the present invention;
FIG. 16 is a cross-sectional view B-B of the structure shown in FIG. 15;
FIG. 17 is a partial schematic view of FIG. 16;
fig. 18 is a third use state reference diagram of an impedance tube expansion structure provided by the embodiment of the present invention;
FIG. 19 is a cross-sectional C-C view of the structure shown in FIG. 18;
FIG. 20 is a schematic partial structure view of FIG. 19;
wherein, in the figures, the respective reference numerals:
100. an impedance tube expanding structure;
01. a transition duct; 011. a first joint; 012. a second joint; 013. a variable diameter pipe section;
02. a square impedance tube; 021. a first square lumen; 0211. a first sample chamber; 022. a transition connecting pipe; 0221. a connecting pipe; 023. a test tube; 0231. a sound transmission installation position; 0231a, a first mounting hole; 0231b, a second mounting hole; 024. a microphone mounting member; 0241. a through hole; 02411. a first bore section; 02412. a second bore section; 0242. a limiting step; 025. an elastic ring;
03. a first size adapter; c1, a first adapting groove; 031. a first adaptation body section; 032. a first transition bezel segment; 0321. a first inclined plane; 0322. a second inclined plane; 0323. a third inclined plane; 04. a first sound transmission chamber; 041. a second sample chamber;
05. a second size adapter; c2, a second adapting groove; 051. a second adaptation body section; 052. a second transition bezel segment; 0521. a fourth slope; 0522. a fifth slope; 0523. a sixth slope; 06. a second sound transmission chamber; 061. a third sample chamber;
07. a first buckle; 08. a first seal ring; 09. a first fastener; 10. a second seal ring;
11. a first connecting member; 12. a second connecting member;
13. a second fastener; 14. a third seal ring;
15. a fourth fastener; 16. a fifth seal ring;
17. a capping structure; 171. a sample delivery pipe; 172. a first end cap; 173. a piston assembly; 1731. a piston; 1732. a piston rod; 174. a second end cap; 175. a sixth fastener; 176. an eighth seal ring;
18. a second buckle; 19. a sixth seal ring; 20. a fifth fastener; 21. a seventh seal ring;
22. a support;
200. a circular impedance tube;
300. a microphone;
s1, a square sample; s2, a square sample; and S3, preparing a square sample.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It will be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
The impedance tube extension 100 provided by the present invention will now be described. As shown in fig. 1, 2, 3, 11, 12 and 13, the resistance tube extension structure 100 includes a transition tube 01, a square resistance tube 02 and a terminating structure 17;
the first end of the transition pipe 01 is provided with a first connector 011, the second end is provided with a second connector 012, and the first connector 011 is detachably connected with the sounding section of the circular impedance tube 200;
the square impedance tube 02 has a first square lumen 021, a first end of the square impedance tube 02 is connected to the second connector 012, and a second end is provided with a first sample lumen 0211 for containing a square sample; a sound transmission mounting position 0231 for mounting a sound transmission structure is arranged on one side, provided with the sound transmission mounting position 0231, of the square impedance tube 02, and the sound transmission mounting position 0231 is positioned between the second connector 012 and the first sample cavity 0211;
the end-capping structure 17 is connected to the second end of the square impedance tube 02 and closes the second end of the square impedance tube 02.
When the impedance tube expanding structure 100 provided by the utility model is used, the sounding section of the circular impedance tube 200 of the traditional circular impedance tube testing system is connected with the first joint 011, and the sound transmission structure of the traditional circular impedance tube testing system is installed at the sound transmission installation position 0231, so that a square sample accommodated in the first sample cavity 0211 can be reliably tested for acoustic performance, and the impedance tube expanding structure is suitable for acoustic super-structural material samples, such as functional sound absorbing parts; because the part of the structure of the traditional circular impedance tube test system is utilized to realize the acoustic performance test of the square sample, when the circular sample needs to be tested, the impedance tube expanding structure 100 is disassembled, and the traditional circular impedance tube test system is assembled, the acoustic performance test of the circular sample can be realized, the resource is saved, the cost is low, and the application range of the impedance tube test system suite comprising the circular impedance tube test system and the impedance tube expanding structure is expanded.
Specifically, the end-capping structure 17 may be connected to the square impedance tube 02 to form an integral structure, the end-capping structure 17 may also be an independent structure fixed to the square impedance tube 02, and preferably, at least a part of the end-capping structure 17 that closes the second end of the square impedance tube 02 may be detachable or openable and closable, so as to sample a square sample from the second end of the square impedance tube 02 into the square impedance tube 02.
Specifically, as shown in fig. 12 and 13, the inner circumference of the first sample chamber 0211 fits the outer circumference of the square sample S1 contained therein when tested.
In an embodiment, as shown in fig. 10, 15, 16 and 17, a first size adapter 03 is further included, the first size adapter 03 has a first fitting groove C1, both ends of the first fitting groove C1 penetrate both ends of the first size adapter 03, and the first size adapter 03 is detachably fitted in the square impedance tube 02;
the wall of the first adaptive groove C1 and one side of the square impedance tube 02, which is provided with the sound transmission mounting position 0231, are enclosed to form a first sound transmission cavity 04, and the cross section of the first sound transmission cavity 04 is square; the first end of the first sound transmission cavity 04 is communicated to the transition pipe 01, and the second end is provided with a second sample cavity 041 for containing a square sample; the circumferential dimension of second sample cavity 041 is smaller than the circumferential dimension of first sample cavity 0211.
The first size adapter 03 is an optional component, and is selectively assembled into the square impedance tube 02 as required, and when the first size adapter 03 is not assembled (as shown in fig. 12), the square sample S1 of the first size can be accommodated in the first sample chamber 0211 for testing, and when the first size adapter 03 is assembled (as shown in fig. 16), the square sample S2 of the second size can be accommodated in the second sample chamber 041 for testing, so that the impedance tube extension 100 can be used for testing the acoustic performance of two different sizes of square samples.
In particular, the first size adapter 03 is U-shaped in cross-section.
Specifically, referring to fig. 13 and 17, the wall of one side of the second sample chamber 041 is a part of the wall of one side of the first sample chamber 0211.
Specifically, in conjunction with fig. 16 and 17, during testing, the inner periphery of second sample cavity 041 conforms to the outer periphery of square sample S2 contained therein.
In one embodiment, as shown in fig. 2, 4 and 12, the transition pipe 01 further comprises a variable diameter pipe segment 013 connected between the first sub 011 and the second sub 012, the inner diameter of the variable diameter pipe segment 013 decreasing in a direction approaching the second sub 012;
the end face of the first end of the square impedance tube 02 abuts against the end face of the reducing tube section 013.
The sound pressure transition is facilitated, and the loss of sound transmitted from the transition tube 01 to the square impedance tube 02 is reduced.
In one embodiment, as shown in fig. 10 and 12, the first size adapter 03 comprises a first adapter body segment 031 and a first transition beveled nose segment 032 connected to one end of the first adapter body segment 031, the first transition beveled nose segment 032 being located at the first end of the first size adapter 03; the three inner sides of the first adapter body section 031 each extend parallel to the axis of the first size adapter 03; the three inner sides of the first transition bezel section 032 both extend obliquely in a direction away from the axis of the first size adapter 03 in a direction away from the first adapter body section 031. The sound pressure transition is facilitated, and the loss of sound transmitted from the transition pipe 01 to the first size adapter 03 is reduced.
As shown in fig. 10 and 16, the three inner sides of the first transition beveled part 032 are respectively a first beveled surface 0321, a second beveled surface 0322 and a third beveled surface 0323.
Preferably, as shown in fig. 16, when the first size adapter 03 is fitted into the square impedance tube 02: in the length direction of the impedance tube extension structure 100, the end surface of the first end of the first size adapter 03 is flush with the end surface of the first end of the square impedance tube 02, which is more beneficial to the sound pressure transition between the transition tube 01 and the first size adapter 03.
When the impedance tube extension 100 includes a first size adapter 03, it is preferred that the transition tube 01 include a variable diameter tube section 013 to facilitate acoustic pressure transition.
In an embodiment, as shown in fig. 10, 18, 19 and 20, a second size adapter 05 is further included, the second size adapter 05 having a second adapter groove C2, both ends of the second adapter groove C2 penetrating both ends of the second size adapter 05, the second size adapter 05 being detachably fitted in the first size adapter 03;
the wall of the second adaptive groove C2 and one side of the square impedance tube 02 provided with the sound transmission mounting position 0231 are enclosed to form a second sound transmission cavity 06, and the cross section of the second sound transmission cavity 06 is square; the first end of the second sound transmission cavity 06 is communicated to the transition pipe 01, the second end is provided with a third sample cavity 061 used for containing a square sample, and the circumferential size of the third sample cavity 061 is smaller than that of the second sample cavity 041.
The first size adapter 03 and the second size adapter 05 are optional components and are selectively assembled in the square impedance tube 02 as required, when the first size adapter 03 and the second size adapter 05 are not assembled, the square sample S1 with the first size can be accommodated in the first sample chamber 0211 for testing, when the first size adapter 03 is assembled and the second size adapter 05 is not assembled (as shown in fig. 16), the square sample S2 with the second size can be accommodated in the second sample chamber 041 for testing, and when the first size adapter 03 and the second size adapter 05 are assembled (as shown in fig. 19), the square sample S3 with the third size can be accommodated in the third sample chamber 061 for testing, so that the impedance tube expanding structure 100 can be used for testing the acoustic performance of the square samples with three different sizes.
Specifically, the second size adapter 05 is U-shaped in cross-section.
In an embodiment, as shown in fig. 10 and 19, second size adapter 05 includes a second adapter body section 051 and a second transition slash section 052 connected to one end of second adapter body section 051, the second transition slash section 052 being located at a first end of second size adapter 05; the three inner sides of the second adaptor body section 051 all extend parallel to the axis of the second size fitting 05; the three inner flanks of the second transition bezel section 052 all extend obliquely in a direction away from the axis of the second adapter body section 051. The sound pressure transition is facilitated, and the loss of sound transmitted from the transition pipe 01 to the second size fitting 05 is reduced.
As shown in fig. 10, the three inner sides of the second transition inclined opening section 052 are respectively a fourth inclined surface 0521, a fifth inclined surface 0522 and a sixth inclined surface 0523.
Preferably, as shown in fig. 19, when the second size adapter 05 is fitted into the first size adapter 03: on the length direction of impedance tube extending structure, the terminal surface parallel and level of the first end of second size adapter 05 is in second adaptation body section 051 and the juncture of second transition bevel connection section 052, more does benefit to the acoustic pressure transition.
More preferably, as shown in fig. 19, when the first size adapter 03 is fitted into the square impedance tube 02 and the second size adapter 05 is fitted into the first size adapter 03:
in the length direction of the impedance tube extension structure 100, the end surface of the first end of the first size adapter 03 is flush with the end surface of the first end of the square impedance tube 02; in the length direction of the impedance tube expansion structure, the end surface of the first end of the second size adapter 05 is flush with the junction of the second adapter body section 051 and the second transition bevel joint section 052; the sound pressure transition between the transition pipe 01, the first size adapter 03 and the second size adapter 05 is facilitated. When the impedance tube extension 100 includes first and second size adapters 03, 05, it is preferred that the transition tube 01 include a variable diameter tube section 013 to facilitate acoustic pressure transition.
More preferably, the first inclined plane 0321 has the same slope as the fourth inclined plane 051, the second inclined plane 0322 has the same slope as the fifth inclined plane 0522, and the third inclined plane 0323 has the same slope as the sixth inclined plane 0523;
in the length direction of the impedance tube extension 100, the end surface of the first end of the second size adapter 05 is flush with the end of the first beveled surface 0321 that is distal from the variable diameter tube section 013, the end of the second beveled surface 0322 that is distal from the variable diameter tube section 013, and the end of the third beveled surface 0323 that is distal from the variable diameter tube section 013;
sound is transferred from the transition tube 01 to the second size adapter 05 through the portion of the first size adapter 03 where the first bevel 0321 is provided, which facilitates the sound pressure transition.
In an embodiment, as shown in fig. 2, 4 and 12, the sealing device further includes a first buckle 07, a first sealing ring 08, a first fastener 09 and a second sealing ring 10;
the transition pipe 01 is detachably connected to the sounding section of the round impedance pipe 200 through a first buckle 07 and is detachably connected to the square impedance pipe 02 through a first fastener 09;
the first connector 011 is connected with the sounding section of the circular impedance tube 200 in a sealing manner through a first sealing ring 08, and the second connector 012 is sealed with the square impedance tube 02 through a second sealing ring 10.
Simple structure, easy dismouting, and the gas tightness of the whole body pipe that the vocal section of guaranteeing circular impedance pipe 200, transition pipe 01 and square impedance pipe 02 connect into guarantees the acoustic performance test reliability.
In one embodiment, as shown in fig. 12 and 16, the acoustic installation positions 0231 are two, two acoustic installation positions 0231 are arranged at intervals along the length direction of the square impedance tube 02, and the two acoustic installation positions 0231 are a first installation hole 0231a and a second installation hole 0231b, respectively;
the impedance tube extension structure 100 further includes a first connection member 11;
the first connector 11 is used to connect the first size adapter 03 to the wall of the square impedance tube 02 facing the first mounting hole 0231 a; the first connector 11 connected to the first size adapter 03 and the square resistance tube 02 faces the first mounting hole 0231a. It is convenient to connect the first size adapter 03 and the square impedance tube 02.
As shown in fig. 19, when the impedance tube extension 100 includes the second size adapter 05, the impedance tube extension 100 further includes the second connector 12;
the second connector 12 is used to connect the second size adapter 05 to the side wall of the first size adapter 03 facing the second mounting hole 0231b; the second connector 12 connected to the second size adapter 05 and the first size adapter 03 faces the second mounting hole 0231b. Facilitating the connection of the second size adapter 05 and the first size adapter 03.
In one embodiment, as shown in fig. 2, 3 and 6, the square impedance tube 02 includes a transition connection tube 022 and a test tube 023;
a first end of the transition connection pipe 022 is used for detachably connecting the second connector 012;
a first end of the test tube 023 is used for being detachably connected with the second connector 012, or a first end of the test tube 023 is used for being detachably connected with a second end of the transition connecting tube 022;
the microphone mounting location 0231 and the first sample chamber 0211 are disposed on the test tube 023.
In one embodiment, as shown in fig. 2 and 12, a second fastening member 13 and a third sealing ring 14 are further included;
the transition pipe 01 is detachably connected to the transition connection pipe 022 by a first fastener 09, and the test pipe 023 is detachably connected to the transition connection pipe 022 by a second fastener 13;
the second connector 012 and the transition connecting pipe 022 are sealed by a second sealing ring 10, and the test pipe 023 and the transition connecting pipe 022 are sealed by a third sealing ring 14.
Simple structure, easily dismouting is favorable to guaranteeing the gas tightness between transition pipe 01, transition connecting pipe 022 and the test pipe 023, guarantees acoustic performance test reliability.
In one embodiment, a third fastener and a fourth sealing ring (not shown) are further included; the test pipe 023 is detachably connected to the transition pipe 01 through a third fastener;
the test tube 023 and the transition tube 01 are sealed through a fourth sealing ring.
Simple structure, easily dismouting is favorable to guaranteeing the gas tightness between transition pipe 01, transition connecting pipe 022 and the test pipe 023, guarantees the acoustic properties test reliability.
In one embodiment, as shown in fig. 2, 5 and 12, the transition connecting tube 022 includes a plurality of connecting tubes 0221 connected end to end, so as to facilitate splicing transition connecting tubes 022 of corresponding lengths as needed.
Preferably, as shown in fig. 2 and 12, the resistance tube extension structure 100 further includes a fourth fastening member 15 and a fifth sealing ring 16; can dismantle the connection through fourth fastener 15 between the adjacent connecting pipe 0221 to it is sealed through fifth sealing washer 16, simple structure, easily dismouting is favorable to guaranteeing the gas tightness.
In one embodiment, as shown in fig. 2, 6-9, and 12, the square impedance tube 02 further includes a microphone mount 024;
the microphone mounting piece 024 is arranged on the sound transmission mounting position 0231, and a through hole 0241 is arranged on the microphone mounting piece 024; the through hole 0241 comprises a first hole section 02411 and a second hole section 02412 which are sequentially communicated, wherein one end of the second hole section 02412 far away from the first hole section 02411 is communicated with a first square pipe cavity 021; a limiting step 0242 is formed between the first hole section 02411 and the second hole section 02412, and the limiting step 0242 is used for limiting the microphone 300 from sliding into the first square tube cavity 021. Simple structure easily connects microphone 300 to and realize microphone 300's spacing.
Preferably, the square impedance tube 02 further includes an elastic ring 025 as shown in fig. 9 and 12, the elastic ring 025 being disposed in the first hole section 02411, and the elastic ring 025 being adapted to hermetically connect an outer circumference of the microphone 300 and an inner circumference of the first hole section 02411. The sealing performance between the microphone 300 and the square impedance tube 02 is ensured, and the reliability of the acoustic performance test is improved.
Specifically, the microphone mount 024 is screwed to the sound transmission mounting position 0231.
In an embodiment, the end-sealing structure 17 is further configured to send the square sample into the square impedance tube 02, so that the square sample is conveniently sent into a testing position, the acoustic performance testing efficiency is improved, and meanwhile, the air tightness is ensured.
Specifically, as shown in fig. 2 and 12, the end-capping structure 17 includes a sample feed tube 171, a first end cap 172, and a plunger assembly 173;
the sample sending tube 171 has a second square lumen, and a first end of the sample sending tube 171 is connected to a second end of the square impedance tube 02;
a first end cap 172 detachably covers the second end of the sample delivery tube 171;
the piston assembly 173 is slidably disposed in the sample sending tube 171, and one end of the piston assembly passes through the first end cap 172; plunger assembly 173 is used to push the square sample entering the second square lumen from the second end of sample presentation tube 171 into square impedance tube 02. Simple structure is convenient for send square sample into the test position, seals square impedance tube 02's second end simultaneously, improves acoustic performance test reliability.
More specifically, as shown in fig. 12, the piston assembly 173 includes a piston 1731 and a piston rod 1732, the piston 1731 is not disposed in the sample delivery tube 171, one end of the piston rod 1732 is connected to the piston 1731, and the other end is slidably disposed on the first end cap 172.
In one embodiment, as shown in fig. 2 and 12, the end-capping structure 17 further includes a second snap 18, a sixth sealing ring 19, a fifth fastener 20, and a seventh sealing ring 21;
the sample sending tube 171 is detachably connected to the square impedance tube 02 through a second buckle 18 and sealed with the square impedance tube 02 through a sixth sealing ring 19;
the first end cap 172 is detachably connected to the sample feeding tube 171 by the fifth fastening member 20, and is sealed with the sample feeding tube 171 by the seventh sealing ring 21. Simple structure, easy dismouting is favorable to guaranteeing the gas tightness.
In one embodiment, as shown in fig. 14, the end-capping structure 17 includes a second end cap 174, and the second end cap 174 is detachably fitted to the second end of the square impedance tube 02, so that the structure is simple and the square impedance tube 02 is sealed, so that the acoustic performance test can be reliably performed.
In one embodiment, as shown in fig. 14, the end-capping structure 17 further comprises a sixth fastener 175 and an eighth seal 176;
the second end cap 172 is detachably attached to the sample feeding tube 171 by a sixth fastening member 175, and is sealed with the sample feeding tube 171 by a seventh sealing ring 21. Simple structure, easy dismouting is favorable to guaranteeing the gas tightness.
Specifically, any one of the first connector 11, the second connector 12, the first fastener 09, the second fastener 13, the third fastener, the fourth fastener 15, the fifth fastener 20, and the sixth fastener 175 is a bolt or a screw. Preferably, the first connector 11 can pass through the first mounting hole 0231a and the second connector 12 can pass through the second mounting hole 0231b to facilitate connection of the first size adapter 03 and the square impedance tube 02 and to facilitate connection of the second size adapter 05 and the first size adapter 03.
In one embodiment, as shown in fig. 2 and 3, the test apparatus further includes a plurality of supports 22, the square impedance tube 02 and the sample delivery tube 171 are connected to the supports 22, and the impedance tube extension is supported on the test table through the supports.
Specifically, the bracket 22 is a U-shaped bracket.
The utility model also provides an impedance tube test system external member, including the impedance tube extending structure 100 that circular impedance tube test system and aforesaid arbitrary embodiment mentioned, circular impedance tube test system includes circular impedance tube 200 and biography sound structure, and the structure of biography sound can be microphone 300. The round impedance tube test system is used independently, acoustic performance test can be carried out on a round sample, the first connector 011 of the transition tube 01 in the impedance tube extension structure 100 is connected to the sounding section of the round impedance tube 200, the sound transmission structure (such as a microphone 300) of the round impedance tube test system is installed at a sound transmission installation position 0231, and then the acoustic performance test can be carried out, so that the acoustic performance test on the round sample and a square sample can be realized through the impedance tube test system kit, and the economical efficiency is improved.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (13)
1. An impedance tube extends structure which characterized in that: the device comprises a transition tube, a square impedance tube and a sealing end structure;
the first end of the transition pipe is provided with a first connector, the second end of the transition pipe is provided with a second connector, and the first connector is detachably connected to the sounding section of the circular impedance pipe;
the square impedance tube is provided with a first square tube cavity, the first end of the square impedance tube is connected to the second connector, and the second end of the square impedance tube is provided with a first sample cavity for containing a square sample; a sound transmission installation position for installing a sound transmission structure is arranged on one side of the square impedance tube and is positioned between the second joint and the first sample cavity;
the end-capping structure is connected to the second end of the square impedance tube and closes the second end of the square impedance tube.
2. The impedance tube extension of claim 1, wherein the square impedance tube comprises a transition connection tube and a test tube;
the first end of the transition connecting pipe is used for being detachably connected to the second connector;
the first end of the test tube is used for being detachably connected to the second joint or the second end of the transition connecting tube;
the sound transmission installation position and the first sample cavity are arranged on the test tube.
3. An impedance tube extension according to claim 1, wherein the square impedance tube further comprises a microphone mounting member and an elastic ring;
the microphone mounting piece is arranged on the sound transmission mounting position and is provided with a through hole; the through hole comprises a first hole section and a second hole section which are sequentially communicated, and one end, far away from the first hole section, of the second hole section is communicated with the first square tube cavity; a limiting step is formed between the first hole section and the second hole section and used for limiting the microphone from sliding into the first square tube cavity;
the elastic ring is arranged in the first hole section and used for connecting the periphery of the microphone and the inner periphery of the first hole section in a sealing mode.
4. An impedance tube extension of claim 1, wherein the end cap structure comprises a sample feed tube, a first end cap and a piston assembly;
the sample sending tube is provided with a second square tube cavity, and the first end of the sample sending tube is connected to the second end of the square impedance tube;
the first end cover is detachably covered on the second end of the sample sending pipe;
the piston assembly is arranged in the sample sending pipe in a sliding mode, and one end of the piston assembly penetrates out of the first end cover; the piston assembly is used for pushing the square sample entering the second square tube cavity from the second end of the sample sending tube into the square impedance tube.
5. An impedance tube extension of claim 1, wherein the end cap includes a second end cap removably covering the second end of the square impedance tube.
6. The impedance tube extension of claim 1, wherein the transition tube further comprises a reducer section connected between the first joint and the second joint, the reducer section having an inner diameter that gradually decreases in a direction approaching the second joint;
the end face of the first end of the square impedance tube is abutted to the end face of the variable diameter tube section.
7. The impedance tube expansion structure according to any one of claims 1 to 6, further comprising a first size adapter having a first fitting groove with both ends thereof passing through both ends thereof, the first size adapter being detachably fitted in the square impedance tube;
the wall of the first adaptive groove and one side of the square impedance tube, which is provided with the sound transmission installation position, are enclosed to form a first sound transmission cavity, and the cross section of the first sound transmission cavity is square; the first end of the first sound transmission cavity is communicated to the transition pipe, and the second end of the first sound transmission cavity is provided with a second sample cavity for containing a square sample; the circumferential dimension of the second sample chamber is smaller than the circumferential dimension of the first sample chamber.
8. The impedance tube extension of claim 7, wherein the first size adapter includes a first adapter body section and a first transition slash section connected to one end of the first adapter body section, the first transition slash section being located at a first end of the first size adapter; three inner sides of the first adapter body section each extend parallel to an axis of the first size fitting; the three inner sides of the first transition slash section, in a direction away from the first adapter body section, each extend slash in a direction away from the axis of the first size adapter.
9. The impedance tube extension of claim 7, further comprising a second size adapter having a second adapter slot, both ends of the second adapter slot passing through both ends of the second size adapter, the second size adapter being detachably fitted in the first size adapter;
the wall of the second adaptive groove and one side of the square impedance tube, which is provided with the sound transmission installation position, are enclosed to form a second sound transmission cavity, and the cross section of the second sound transmission cavity is square; the first end of the second sound transmission cavity is communicated to the transition pipe, the second end of the second sound transmission cavity is provided with a third sample cavity used for containing a square sample, and the circumferential size of the third sample cavity is smaller than that of the second sample cavity.
10. The impedance tube extension of claim 9, wherein the second size adapter includes a second adapter body section and a second transition slash section connected to one end of the second adapter body section, the second transition slash section being located at a first end of the second size adapter; three inner sides of the second adapter body section each extend parallel to the axis of the second size fitting; the three inner sides of the second transition slash section, in a direction away from the second adapter body section, each extend slash in a direction away from the axis of the second size adapter.
11. The impedance tube extension of claim 10, wherein an end face of the first end of the first size adapter is flush with an end face of the first end of the square impedance tube in a length direction of the impedance tube extension;
in a length direction of the impedance tube extension structure, an end face of the first end of the second size adapter is flush with a boundary of the second adapter body section and the second transition bevel connection section.
12. The impedance tube expansion structure according to claim 9, wherein the number of the sound transmission installation positions is two, the two sound transmission installation positions are arranged at intervals along the length direction of the square impedance tube, and the two sound transmission installation positions are a first installation hole and a second installation hole respectively;
the impedance tube expansion structure further comprises a first connecting piece and a second connecting piece;
the first connecting piece is used for connecting the first size adapter to the pipe wall of the square impedance pipe, facing the first mounting hole; the first connector connected to the first size adapter and the square impedance tube is aligned with the first mounting hole;
the second connector is used for connecting the second size adapter to the side wall of the first size adapter facing the second mounting hole; the second connector connected to the second size adapter and the first size adapter faces the second mounting hole.
13. An impedance tube test system kit comprising a circular impedance tube test system comprising a circular impedance tube and a sound transmission structure, characterized by further comprising an impedance tube extension structure of any one of claims 1-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221618549.3U CN218006520U (en) | 2022-06-24 | 2022-06-24 | Impedance tube expansion structure and impedance tube test system suite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221618549.3U CN218006520U (en) | 2022-06-24 | 2022-06-24 | Impedance tube expansion structure and impedance tube test system suite |
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| Publication Number | Publication Date |
|---|---|
| CN218006520U true CN218006520U (en) | 2022-12-09 |
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| CN202221618549.3U Active CN218006520U (en) | 2022-06-24 | 2022-06-24 | Impedance tube expansion structure and impedance tube test system suite |
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| Country | Link |
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| CN (1) | CN218006520U (en) |
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